When I Try to connect from Ubuntu with FreeRDP to Windows 2008 R2 with NLA:

[14:29:31:523] [1146:-1236755648] [ERROR][com.freerdp.core] - connect
[14:29:31:523] [1146:-1236755648] [ERROR][com.freerdp.core.nego] - Protocol Security Negotiation Failure
[14:29:31:523] [1146:-1236755648] [ERROR][com.freerdp.core] - freerdp_set_last_error 0x2000C
[14:29:31:523] [1146:-1236755648] [ERROR][com.freerdp.core.connection] - Error: protocol security negotiation or connection failure

For anyone else experiencing this, it occurs because Network Level Authentication is enabled on the Windows host.


I had the same error message. I resolved it by using the following on the Command Line:

xfreerdp /sec:rdp /u:fake.user /v:fake.host.com

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